Won't take an unreasonable amount of work to spruce the immediate area up to tourist standards. Sullivan Square and the immediate area of the casino just finally needs to move forward with some long planned redevelopment. Not for the casino sake, but maybe the casino dollars can be put to use.
Would be good if the taller old smoke stacks can come down like they have recently in Salem. I think the smaller three old stacks are just used for high demand if they are still used at all. The tall stack, if I recall my grade school tour and maybe an earlier discussion on these boards, can be used for oil or natural gas, so it likely still has some utility if the price of natural gas goes back up. Otherwise I believe the newer lower profile stacks are part of a much more efficient and less polluting natural gas generating system. Would be good if anyone had more info on the power plant operations or any future plans. Maybe Salem coming back online with new generation capacity could enable Everett to decommission the older facilities.
Tangent -- I believe that current operation at the plant is concentrated in the new highly efficient combined-cycle natural gas units -- as you identified the shorter thick smoke stacks, one of the older dual -fuel steam units [tall stack], and a fast reaction combustion turbine used for "peaking"
http://www.exeloncorp.com/locations/power-plants/mystic-generating-station
Mystic Generating Station is owned and operated by Exelon Power, a business unit of Exelon Generation. Mystic is an eight unit, 1,998 megawatt (MW) fossil power plant located in Charlestown, Massachusetts.
Mystic 8 and 9 are 2-on-1 combined cycle gas turbines. Mystic 8 has a capacity of 703 MW and Mystic 9 has a capacity of 711 MW. Mystic 7 is a 576 MW unit that is fueled by either natural gas or oil, depending on market conditions. Mystic Jet is an 8 MW oil fueled peaking unit which is run during periods of high demand. All capacities reflect summer rating.
As a point of reference the name-plate rating on the nearby Wind Turbine located at the Massachusetts Water Resources Authority (MWRA) DeLauri Pump Station in Charlestown on the Everett line is 1.5 MW with a reasonable expectation of an average output of a bit less than 1/2000 of the fossil fuel plant