It is not even certain that the UASF initiative will get accepted at all, let alone big investors going to pour their money into Bitcoin. If only just one big investor invested in Bitcoin any decent amount of dough, we would have already seen prices in many thousands by now
UASF is not viable solution - activation of soft fork without support of hash power is risky as miners are not obliged to follow.
Without majority hash power there is possibility that even one invalid block could split the chain and majority (by mistake) could use that invalid block as a cornerstone.
It is not exactly a soft fork anymore if even one invalid block can fuck up a whole BTC network. USAF is much too risky even than BU.