I think it could be a good thing really. I mean, pros, The systems will actually feel like there is a war going on, its not just silence. People who want to go pew pew in thier ships can without fear of being shoved out of the fight for 4 hours and having to find something else to do while everyone else not dead gets to enjoy themselfs. Good combat practise for those who don't see much of it anymore and although I'm sure the fights will last a long time, I very much doubt it'll be the "never ending battle" most people seem to claim it will be.
Obvioulsy, as mentioned, there is the issue of people docking on bases they shouldn't. I know for a fact I'm not going to do something like that but it doesn't change the fact I know theres deffinatly some people out there who will. I'm sure theres something that can be done about that should it become a problem (FR5's?) but on the whole I think its a good idea. Yes the LN vs RM fights can be epic at times when theres a lot of people involved but they don't last as long as I would like and I spend less time going "Wow this fight is amazing!" and more time going "God I hope I don't get killed off too quickly".