Same old moaning. Remove the cash ISA benefit and many people will not move it all into an S&S UK only ISA, they'll take the tax hit or buy gilts, premium bonds, a nice holiday etc. There may be an argument for having a cap on total ISA funds - cash and S&S rather than reducing/removing the yearly allowance.
I keep banging on about it, The UK would be invested in more if it was actually attractive to invest in more, not by forcing individuals or large pension funds!