Its not completly true every full node carry the entire burden of the network. At least you can set your full node network and disk usage to your liking. Every node should set its network and disk usage policy individually:

Network usage can be defined by number of connections, and if it is not enought you might choose to accept and relay only blocks and not transactions. On a side note if RBF transactions become popular because of continuously full blocks, the Bitcoin network bandwith usage going to be much higher than any block size increase, the re relay of the same transactions with slighly higher fees can be real burden to Bitcoin network bandwith in future. Obviously here can be a lot to be improved for the client to follow specific user network bandwith policy.

About disk usage, you might run prunned version and still have full validating node. You may choose how much disk space you want to use to archive historic blocks for others to upload, but unless you specially need all historic blocks for yourselves, there is no need for every node to have all historic blocks for the Bitcoin network to function normally.