There are already 2TB SSDs available for less than 80€ and prices are expected to go even lower.
I agree with Artic Mine and believe storage is not going to be a problem for Monero and that the only real bottleneck is upload speed.
What do you think?
Sadly, you can only guarantee that fees will stay at the same amount (or drop in your example) if we assume infinite scaling. Suppose 10 TB of transaction data shows up and wants to be mined into the next block. Fees only stay at the same value if you widen the block size to 10 TB. If you didn’t, then some people would be willing to pay more than others to get into the next block.
That is why it is critical for Monero to keep innovating, if we are able to keep reducing TX size, keep bloat away from the chain (NFT, and other crap), and incorporate better pruning techniques there should be no issues with accommodating any realistic volume that will happen. Highly doubt a block will get to 10MB in the next 10 years much less 10TB.