agreeing with everyone who says "blocks aren't full yet", or "Bitcoin needs validation performance increases first so the network can handle it"
Validation performance didn't even enter my mind, that's a huge point. You wouldn't just need more storage space, doing things like running a full node on an rpi3 would become more difficult.
Double SHA256 is not a huge bottleneck in terms of validation; if anything, it would just be the merkle tree size. Running full nodes on a Raspberry Pis is a bad idea in general. Low network performance and moderate to OK CPU performance.