Why would you need 2 TB SSD to store 512 MB of data? (we are talking about running a node here, right?) Even if you wanted to store the full blockchain 2 TB HDDs are cheap and would be enough for long time to the future.
How do you maintain all blockchain when block size limit will be 8 MB? Blockchain is almost 50 GB already. It'll be 63 GB before new year. Imagine we see 8 MB blocks every 10 minutes. Even 2 TB would be obsolete in 5 years.
If you don't want any problems you don't store your blockchain in HDD. You need a good SSD. Running Bitcoin Core is very expensive even right now.
I'm actually using SSD myself too, so I don't know if there would be problems using HDD. What would they be?
8MB block limit doesn't mean that all blocks will be full. But let's say they were. 5 years is still a very long time and by then larger drives would be cheaper.
Also why should everybody store the full blockchain? Blockchain size doesn't really matter (aside from sync time) if most nodes use a pruned chain that only contains the latest history.