1. Delete any BTC addresses that has less than .001 BTC. Add a merge function button in the wallet that moves any BTC too small together. Let everyone know the chain will restart and only keep btc addresses over .001 in the new chain.
Removing addresses is a bad idea, see previous post.
Developing a really good bitcoin blockchain compression would be the way to go.
Possibly making a core client that could selectively download only relevant blocks from the swarm.
Allow nodes to be nodes and end users to be just end users.
Having every end user download the whole blockchain is more of a burden on the nodes than letting them download only blocks they need.