Thanks, I forgot about the automatic increase/decrease in difficulty as miners come and go. Why won't increasing the transactions per block scale forever? I see

Thanks, I forgot about the automatic increase/decrease in difficulty as miners come and go. Why won't increasing the transactions per block scale forever? I see lots of people saying it's not a permanent solution. Is the SegWit stuff basically just going to allow for 'meta-transactions' so that you can create a faster overlay network as a sort of clearing house?