don't you think that the blockchains is getting big enough to create some problem to run a full-node?
What is now? 140gb?
You can get a decent 1TB hard drive for $60-70, so for the average Westerner that's not really a problem at all. The problem is primarily about bandwidth rather than storage space.
And what will happen if after the fork everyblock will be of 2mb istead of 1?
It seems unlikely that that chain will be regarded as "Bitcoin" after the fork, but if it is, it still wouldn't be a problem unless the space was actually being used, and even if it was it would be easy enough to run a full node for a lot of people.
I can see the point of the article, but in a lot of circumstances I do consider it to be OK to run an SPV wallet, provided that you require some more confirmations to be 100% sure of the transactions.
If you're very poor or you're just being introduced to BTC, it's perfectly reasonable to run an SPV wallet.