If anyone knows Satoshi, getting him/her to come back for a little to see what they think about the block size issue we currently have.
What makes you think Satoshi has more insight than any of the devs? Regardless, I'm sure he's keeping up with the development.
1. Will transaction fees be enough to secure the network forever? Will miners make enough from TX fee's?
This is important because everyone gives a different answer, from TX mining will be plenty profitable to Bitcoin will not function properly after 2140.
Yes. There is no apparent reason for miners to refrain from adjusting fees in accordance with mining costs. The only problem is about communicating these fees to users without involving centralization.
2. The blocksize issue, This is causing a divide, it would be nice if Satoshi came here and described what he/her thinks would be best.
If we need an authority to resolve these issues, we're doomed.
If I can continue to run a node myself with a modest budget, even with an elastic blocksize, then I'm for it. It seems that way for now. It was apparent from the beginning that the ordinary user wouldn't be able to run a full node when Bitcoin got popular. As long as hobbyists and ordinary businesses still can, we'll be fine.
3. The Satoshi clients needs to have a option to only download the past months worth of blocks, with maybe the network rewarding those who keep full nodes working.
I think Satoshi client will have three modes. One lightweight mode that only downloads potentially relevant transactions, one pruned mode that only keeps a compact database of unspent transactions, and one full mode that keeps everything. People that can handle traffic but not storage will be able to run in the compact mode and they will still be capable of fully validating transactions.
I remember that these issues were hashed over and over since before Satoshi disappeared. Actually, there was a scientific paper about this subject not long ago, though AFAIK it focused on relaying traffic.
It seems to me that there will always be enough incentive for serious entities involved with Bitcoin to run a full node. We don't need them to validate transactions, but for other things, like notarization or firstbits addresses.