Well, firstly pre-'94 there were no forced pitstops (i.e. no dual compound nonsense to 'spice up' the races). Secondly, it did spoil the racing to an extent, though not as much as the refuelling addition, because lugging lots of fuel around or, conversely, stopping for quick top-ups, added 'strategy'.
I'd be quite happy with allowing pitstops for tyres if they needed or wanted them, but I'd like that in conjuction with a tyre that could go the distance as well.
What F1 shouldn't be about is artificiality*, so forced pitstops, forced compound changes or 'push-to-pass' should never be allowed. KERS is okay, to a point, because it's optional and gives massive downsides too. When everyone has it it'll be boring and pointless. It's not even 'green'.
*Alan [intrepid] would probably say it already is artificial, but this is most likely because he, or anyone he's ever "mentored" never got out of go-karts, but has a deep down desire to get on the ladder to F1 and is therefore bitter.