At the rate the bitcoin blockchain grows in size, 2.2x the growth worries me a lot more than 1x growth.
It really shouldn't. Doubling the storage requirements is mathematically very little. If you can afford to store 10 GB, you can almost assuredly afford to store 20 GB. If you can afford to store 1 TB you can almost assuredly afford to store 2 TB.
Yes, while doubling RAM isn't so simple due to limited RAM slots on most personal computers, meaning you have to usually throw some sticks out to add more. Most personal computers though have room to add an extra HDD. And I don't think RAM prices scale linearly like HDD storage.