I know it is not only about capacity but facilities/access etc. But if we do go up and anyone chucks the capacity issue at us, it is worth bearing in mind the following current capacities:
Wrexflix (with al their circus) 13,341 Luton (in Prem last season) 12,056 Bournemouth (established Prem club) 11,307 County 10,852. Wycombe (recently in Championship and with us in play offs) 10,446. Leyton Orient (likely to be in play offs with us) 9.271. My father was a County fan like my grandfather before :-)
We've had this question under previous managers, and regardless of what you think of the squad or the ground, the answer has to be "if you can get it take it, we're ready".
Having a better squad or ground guarantees fook all. The squad might not gel, some players will get injured, and there's no saying how strong other teams could be.
If it's there have it, and worry about next season during the summer.