Look at the 10 minute block time restriction. Whatever you do with SegWit ( which is brilliant ), or with blocksize changes, you will still be looking at up to 30 minutes for a confirmation. That's a long time for an on-line service these days.
The 10 minutes blocktime is good. Segregated Witness, if this is ever combined with the 2 MB blocksize increase, will greatly improve confirmation times. Even alone it could greatly help us.
i agree 2mb+segwit would be great. but a 16 month rollout period.. not so great