Neuroharmony
But you wouldn't say that the structure of P5 is outdated, would you? On the contrary, I think it remains fresh and ahead of its time. And of course, if you want to add new things to P5, just get some new plug-ins for it. Ultimately the plug-ins are what you use most. The DAW is just a place to do your work.
It is outdated though...without multicore support, it will become ever more difficult to run newer, more cpu demanding plugins. You can also factor in the inability to setup sub groups for mixing, no 64-bit support, no sidechain etc. Although there are workarounds to various of these, there are that many other DAWs out there that offer these facilities without the workarounds (and that are still being actively developed and fixed) that most people have moved on.
As for Cakewalk potentially resurrecting P5 if they see a vibrant community here: there was a vibrant community here and they still terminated the software...so I wouldn't expect that decision to ever be reversed. I do agree with the point that was made that P5 would have been a better starting point for X1, although Cakewalk should have just been brave and started from scratch, killing a lot of the legacy code in the process...
On a different note: as I do little on this forum usually, other than read a few posts, I've just noticed that quoting stuff with Firefox is broken...