I agree with pretty much everything you said. I'm putting about 5% of my BTC into SP at a time, and looking for a sharp correction to possibly buy more at once. I'm definitely still holding both BTC and SP because I see BTC becoming a true currency and that is a tremendous accomplishment and obviously has huge value to the world.
As for 2 years -- yes it's a long time, but I should also update this post to show that you get 104 payments over the 2 year time if you "Power Down" your SP into STEEM. So you would be receiving installments over the 2 year period and it would finish converting in 2 years.