Standard play should be a metagame where the highest amount of Pokemon are good enough to be considered for usage. That's my opinion.
That would be UU. Which shows just how much OU is screwed up.
That's not necessarily true - I've had more than one successful team without Blissey, and I know a lot of offense teams don't carry it. It just requires you to think a little bit smarter and play off resistances/etc.I disagree. I'll use an example that I've used for banning Snover in UU. Snover alone is not overpowering in UU. However, Walrein, Lapras and Glaceon are arguably too powerful for UU when auto-hail is on. Therefore, Snover is banned, because banning only 1 pokemon is better for the metagame than banning 3.
Arguably, banning Blissey from the metagame decreases the size of the metagame. Specsmence counters drop to pokemon who can't recover off the damage (Empoleon, Tentacruel, etc. etc.) Yes, other special walls will become more popular but the metagame will shrink towards specialized counters to Specsmence and other high powered Sp. Attackers.