Are there any plans to trim, slim, or otherwise reduce the size of the blockchain?

The blockchain is increasing it size rapidly, I am forced to ask, are there any plans to make a slim node that doesn’t have all functionalities and doesn’t need the whole blockchain? or are there plans of doing something to trim down the blockchain? reduce its size, optimize, shard, or otherwise trim the blockchain?

State channels are a great start to offload transactions offline to not have to write everything. Are there other initiatives for this?