Internet connection speed isn't biggest problem here, the biggest problem in this case are metered bandwitch and low-end/cheap computer won't able run bitcoin full nodes anymore. Mini PC such as Raspberry Pi 3B will struggle since they have small RAM.
It's no problem if most of people who run full nodes can afford better computer to run full nodes.
solution for users independantly
(same solution for torrent seeds)
reduce number of leachers(connections) = less bandwidth draw*
solution for dev implementations
reduce sigops and max txbytes = less ram/cpu demand
afterall with todays 4ktxsigops with 20k max block sigops
and segwits 16k txsigops 80k blocksigops.. that means a base block can be filled with just 5 tx's
and the max tx bytes of 100kb = 10 tx fills base block..
WHO THE F*CK deserves to have 10%-20% of the blocksize for just 1 tx..!!!!
reduce the greedy stupid, artificially high numbers, meaning transactions become leaner. and you will find that bloat, bottlenecking and processing time REDUCE all while allowing the block size to increase.
*i see many people with 'capped' internet that have 50+ connections. i facepalm them and tell them to learn "6 degree's of separation" and reduce their connection count.
not everyone needs to be a 'supernode' (multiple dozens of connections)