Even if Blackpool get the maximum 12 point penalty, they will still be outside the relegation zone (18th I think), and should stay out of it as their form is better than most other teams around there. It will push Argyle up the table (to 13th), but Blackpool would only be 2 points behind. I f they don't get any deduction they will still be 8th, and only an outside chance of the playoffs. Unsure what effect going into administration will have (selling any players etc...), but I think they will stay in L1 for next season either way. As said above, I think the fans will be happy to pay any price.
Coventry face a greater possible penalty - being kicked out of the league. This issue centres on uncertainty about their use of the Ricoh stadium next year, and it is not a mess of their own making. Cov have been homeless before, and had to play their games at Northampton for a while. I expect something similar could be arranged this time if needs be. I can't see them being kicked out.