I agree with Tristan, sense is one of the pillar of teamplay in MBII as well as an almost necessary tool to stay alive.
Even if the saberists don't communicate the enemy's location directly, they can still prevent ambushes and force campers to retreat by attacking them or at least going in defensive mode, informing their teamates that something is up. They futher provide feedback on how the round is going, most notably flanking. The result in futher nerfing sense in my opinion would be that the rythm of MBII would be much slower, you have to very carefully inspect every room, make sure there's not going to be a sniper hiding waiting for you to have your back turned or a hanging saberist waiting to flank. Snipers (heroes-bh-mandos) would benefit from this tremendously due to their firepower (especially the more hardcore snipers like heroes and bh, which, in my opinion, are already too much of a pain in the ass for saberists with the steroid fueled heroes that can outrun Usain Bolt, the BH that straight up stop your sense regen forcing you to retreat, and of course their portable Death star that is P3). It would especially benefit the defenders as they get much more of an advantage as they know where the enemy will be coming from and can very easily set up ambushes (not thinking just of snipers but of rockets as well).
On an individual level saberists almost completely lose their ability to wander off by themselves (whether it's positive or negative obviously depends of who you're asking but at least it reduces the possibilities of playing as a saberist gameplay wise). Sense allows saberists to close the distance, something they absolutely imo need when going on their own or charging in a new room when they're backed up by their team.
Teamplay so far imo is based on (at least most of the time), saberists acting as wall, preventing the enemy from advancing while their gunners force the enemy to retreat. Removing sense would force saberists to check every angle to make sure they don't get jumped by a sniper at close range with their shotgun, I mean sniper rifles, a wook that can knock them down or kill them within a sec or a SBD knocking them down and blasting them.
And I didn't state what is to me the most obvious change but it's the fact that saberists become almost inaccessible for new players. I mean MBII by default is tough for saberists to learn the game, and with 1.4 having all those nerfs and flinch for absolutely every gun, I can only imagine that only the most hardcore bdsm practitioners would try to learn how to play as a saberist now. Removing sense would essentially be making them blind in my opinion: they don't know where the hiding spots are on every map, where the ambush spots are and so on.
Removing sense would very effectively imo almost completely remove saberists from MBII overtime. I really don't get why you'd want to make saberists harder to play, most saberists that I see tend to have a K/D below 1, only the experienced ones get one above 1 and it rarely goes beyong 1.5-2 (apart from the few master saberists we have).
And I don't truly see how you could make sense weaker. Sense 1 costs 20, prevents regen of FPs for about 2 secs (because Sense 1 only lasts that long) and only updates your minimap at short-medium range. It's not really something you use in combat except if you're protecting your teamates during a firefight. Definitely not something you use in 1vs1 against gunners either. Sense 2 costs the same I believe but highlights the enemies, telling you their Z coordinate and giving you a hint at what class they're using and sense 2 lasts longer. Sense 3 lasts a really long time and work at longe range but against blocks your force regen (apart from when you're meditating, which I think is a smart idea). Sense 3 is really more for teamplayers, to inform your team of where enemies are, where they are going. Now that's in theory because in practice sense messes up a lot imo, a LOT of doors and walls block sense.
I feel nerfing/removing sense wouldn't just make saberists far weaker but also slower the pace of the game as well as advantaging the defending side and finally buffing snipers (which, quite frankly, I could really do without given how they currently are).
Now of course this is a very biased opinion, since I mostly play saberist.