Don't see what the issue is. If you want to change the page content your going to have to move your mouse over the list of items anyways. Greying out is actually a ‘nice’ touch IMO; Old man speaking here btw.
Plenty of grey in my hair, and I've never had an issue with the column greying out. Never even registered in my head as something noteworthy, in fact. I had to load up the page right now to see what was being described.