If the dome is not going to be used for anything then I say tear it down and make room for a Soccer Specific Stadium. Bring in a MLS franchise and build a 22,000 to 25,000 seat soccer stadium. Maybe they could do something to remember the Astrodome by building a monument or incorporating some of it's aspects in the new stadium. This would put Houston on the map globally and maybe get to host some World Cup Qualifiers or International Matches. No doubt that a SSS would bring more excitement to the city and offer more entertainment and diversity than the dome is offering now!