Hey I'd be fine with a 5 MB block size limit, and some percentage increase every year afterward. I think 20 MB would probably be better, but that's far less important than putting in place some dynamic hard limit, ANY dynamic hard limit, that steadily increases, year by year, so that we never have to do a hard fork again to change the limit.
If this limit increases faster than than the interest in spending money for transactions then it will kill Bitcoin. It has to cost quite a lot to do transactions. If it doesn't there will be too little interest in mining, and a 50% attack will be cheap. Currently the interest is going down, so there is a fairly large chance that any changes will do more harm than good. What's certain is that if there is a fork then all kinds of problems and scams will follow, and the Bitcoin critics will have a field day in the media.