I've been saying for a while (and keep getting shot down) that we are seriously looking at the feasibility of a new stadium on the old Clayton Aniline site. The fact is we can only increase the size of CoMS to 60,00 tops but the disruption involved in that would mean significant closures for 2 seasons.
The reason for this is tied up with the future economic model of the club. We don't have enough corporate facilities and are looking to have around 10-12,000. These are what bring in the big money and the rags pull in nearly £3.5m every Premiership home game because of their corporate offering. Less than 10,000 people bring in 2/3rds (over £2m) of that.