Mr Pessimist calling.
Alton is designed around outdoor attractions, and has few indoor attractions for adults.
Investment for full year opening would have to be substantial, more indoor stuff, increased infrastructure costs, but for what purpose?
The vast majority of the public do not do theme parks in winter, not in this country, so there is no real market.
Economics means there is no real money in year round opening, winter is a long, quiet, cold, wet, season...not Towers weather for the vast majority of punters.
Lack of demand, not a real chance of anything like full year, full park running.