while the idea of extending any given sets length of time to be available in standard is good in theory, in practice I'm sure it's a nightmare.
Magic is an insanely complex game in any of its formats, as far as standard, the one thing that holds it together would have to be the regularly schedueled rotation, imagine if they had to take into account one set being around for as long as you described, the potential for one card like snapcaster to be run along side another card from another set and potentially become broken, this issue is more easily avoided with the current method of rotation in place.
Dial it back all the way to the design phase and testing phases of new sets and finding all kinds of broken loopholes because too many sets are all standard legal at the same time.
We all respect the ban list, why it exist's and the purpose it serves. That list would be constantly changing with each set release with your projected standard season rotation cycle changes.
I'm not saying I can list concrete proof of broken'ness, but I'd have to assume it would be atleast somewhat similar to what I've described here.
Magic is an insanely complex game in any of its formats, as far as standard, the one thing that holds it together would have to be the regularly schedueled rotation, imagine if they had to take into account one set being around for as long as you described, the potential for one card like snapcaster to be run along side another card from another set and potentially become broken, this issue is more easily avoided with the current method of rotation in place.
Dial it back all the way to the design phase and testing phases of new sets and finding all kinds of broken loopholes because too many sets are all standard legal at the same time.
We all respect the ban list, why it exist's and the purpose it serves. That list would be constantly changing with each set release with your projected standard season rotation cycle changes.
I'm not saying I can list concrete proof of broken'ness, but I'd have to assume it would be atleast somewhat similar to what I've described here.