It's not that you can't late game TvP. My point is that you cannot play a passive TvP lategame. You have to do some sort of 2 base timing and get some damage done and some pressure on the protoss because once he has 6+ colossus and templar mixed in you cannot beat it unless you get a really lucky engagement.
The alternatives to this strategy is to execute a 1 base timing with something like banshees or blue flames into either an all in or an expansion, or to get a really fast 3rd and power units like crazy. This is how you play TvP successfully.
TvZ has room for passive play but it has to be performed in response to how the Zerg is playing. A lot of 2 base timings rely on your opponent playing greedy and if there is no greed to exploit then you have to take a 3rd and start digging in and preparing a big push. Like I said, you can't let those other dirty races play the lategame they want to.
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