Lets assume Higgs have made zero allowance for this despite the pitch having a known lifespan.
This isn't relevant to the discussion, there is no suggestion that Higgs don't have the money.
Including interest at 5% that equates to less than 2 hours hire per week.
No it doesn't, thats revenue not profit, they need that much more profit compared to doing something else with the space.
You also have to remember it's probably only the academy that require a third generation synthetic pitch, would a much cheaper artificial surface still provide them with all the other non academy business? Just a thought and could be wrong.
I would suggest that as the only such facility in the area if they can't achieve much more than that they should be looking at how they are running their business. I can't imagine they would get anywhere close to £125 an hour for a regular hall or any other use plus there would be a conversion cost, it wouldn't just be taking up the pitch and off you go.
For me there is no doubt that replacing the pitch is financially viable for Higgs with or with the academy there so the only conclusion I can draw is that the threat to not do so is a deliberate move to cause problems for the football club an it's current owners.
If it is viable then I'm sure they will do it, if they wished to cause problems they had the opportunity not to agree to the short term deal in the first place, they already had the chance to completely fuck the academy.