As a safely feet dry on terra firma ATCO, I believe anything that improves situational awarness for the NS pilots has to be good.....
However! There is always a danger of complacancy creeping in with equipment like TCAS. From what I have seen on the Radar screen over 20+ years at the Ice Station, quite a high proportion of those ultra-fast, swing-wing, pointy things fly around offshore with the transponder/IFF switched OFF - and when they are operating as a "pair" (or bigger "formation") often only the "Lead" has the Transponder/IFF on. Therefore, there will still be a lot of potential conflicting traffic which will NEVER show on your TCAS/whatever, display.
DD