£1m + is totally viable. Every season ticket holder at the entry level is £1.1m. Of course, not everyone can do that, but some can and will buy the higher priced options. Chuck in just a few 1886 members and it's easy to see how this works. You don't have to do it by March, do it when you can or spread the cost as descibed above.
If we all get together and participate at the level or in the way we can afford, this works.