For a while now, Wizards has been moving towards more tix in, pax out formats. This has put serious downward pressure on the price of most boosters.
This deflation is a Bad Thing.
When the value of the boosters on the secondary market falls, prize payouts across the board fall with them. Even the few formats that still take in boosters don't stand to gain much from this - lower entry, lower prizes is mostly a wash.
There are many ways to correct this trend, but most require either Wizards to lose revenue (a non-starter) or shift the deflationary pressure from unopened packs to the cards contained within (also a negative effect). There is, however, one pretty solid solution to this that pulls out a win for everyone.
(Name may need work!)
This is a sealed deck format, designed for bigger tournaments where you can bring any six packs - as long as no more than three are from the same set.
There are three main advantages to this format over any other solution so far:
The first is that it increases the incentive to hold packs. Devout players would want to have a wide arsenal to choose from, and you never know when a new set that comes out would interact positively with some random old set.
The second is that it would increase the value of all packs, regardless of payout skews (like the ones that appear in mixed-set drafting). For example, packs from Legions can currently be had for less than 1 ticket each. Maybe the creature count of Legions would work well with the equipments from the original Mirrodin set (which costs about 2.5 tix, at the moment)? You could play for half price!
The third is that it would be fun! One of the biggest reasons to play limited is the "different experience every time" factor. Meta-Sealed would make it that much more different.
Mechanically speaking, I think this would probably be best implemented via saving a decklist of packs, then using that to enter the tournament (similar to how constructed does it).