I don't know if it's all speculation but Solana has a big storage problem and when it's used under load, Solana blockchain will grow a lot very fast.
Experts have said it is really hard to run a node, even if you are a coder because hardware requirements, updating and maintaining are extremely difficult.
For example, SEQ has said:
Another easy way to achieve higher performance is to increase the hardware requirements for running a node, the more hardware resources, the higher the performance, but yet again at the expense of decentralisation.
Solana recommends validators run hardware with 24 Cores, 128 GB Memory, 4 TB NVMe disks, Nvidia 2080 ti graphics cards (4000 cores) and very high bandwidth connections. This limits those capable of running a node though due to the expense, similar to Bitcoin ASIC mining rigs.
Maybe Solana has found a way how to solve it, but I can't find any announce. If it's solved, it would also mean it is solved for all Blockchains because Bitcoin and Ethereum have also storage Problems, you know Bitcoin can only process 10 transactions per second because a block is limited to 1 MB and no more transactions can go in a block.
Big Blockers like BCH and BSV have arrived and now say: "make bigger blocks to get more transactions into a block". At first sight, it is very good because more transactions are now in a block and it has more capacity like 100 transactions per second but at second sight, big blocks are really bad for a blockchain long term.
After let's say 10 years, a big block blockchain is so big and has so much data because blocks are so big, it is very bad for nodes to download and leading to centralisation.
Big block is no solution.
And Solana has an extreme big block blockchain problem because it's fast but has so much data collected over even 1 year, Solana blockchain will grow massively and will become very useless soon because it will get so big.
Storage problem is very bad at Solana if it can't get solved, even more bad like Bitcoin SV.
