Excellent point about simply not upgrading the TIU or remote software once you get it all working. If there are no meaningful upgrades for your operating environment and locomotives, let sleeping dogs lie.
This often the advice I used to give people in the computer world - but security issues have rendered that advice useless. Thankfully we mostly don't have to worry about that with our trains (WIU/phone/tablet excluded of course). That said, what happens to us remote users when the new DCS company adds a new PS3 feature - or "PS4" comes out? Hopefully there will at least be some period of overlap in compatibility, but I could see a time in the future where the Remotes may not be able to operate a new feature or a new version of ProtoSound.
That said, I'm still down for one more remote in the mean time.