I did play TFC for a few years and I am perfectly fine with the direction they are going. If I want realistic squad based combat I'll go play BF2. TFC for me was more about having fun than being realistic. If realism is your thing then try Fortress Forever when it comes out.
http://www.fortress-forever.com/
The "community" that voices its opinion on the steampowered forums seems to be split 50/50. Some love it... some don't.
I'm just speculating but I believe that once they started working on the Source engine HL2 and CS:S became more of a priority because the sheer amount of people playing CS dwarfed the TFC community. Yeah they might have had that one guy punching in the 1's and 0's working on TF2:BoA but he was like Milton from OfficeSpace... and they took his stapler.
But anyway... I am sure I will get ripped to shreds for speculating. I just feel that any sequel/update to TFC was always on the back burner for Valve.