If the block limit of 1mb will inevitably be eliminated, why refuse an increase in the size of the blocks at critical times like the ones we have seen these days?
Among other reasons: because, as our good Mayor implies in his reply, a hardfork is required to increase the block size. A hardfork is not unplanned for, but when it happens it should include a bundle of fixes, not just a quick bandaid.
Besides, the bandaid can't really solve the problem, even momentarily: if the spammers are willing to spam no matter what, they can as easily fill double-sized blocks with 1-satoshi transactions.