I’ve heard this before. I don’t think Speedway’s ills can be placed solely on the TV deal. The RFL in some manner have learnt because they’ve successfully secured free to air coverage. I reckon you could date Speedway’s problems to when they lost the GP highlights package on free to air.
The emergence of the Polish League into a professional set up which could see them pay its competitors enough that they didn’t have to race any other league. Alongside that Speedway has fallen victim to the economy where land which can be developed for residential units. Nearly 85% of teams don’t own their homes - as result the stadiums are mostly shoddy and have zero attraction to anyone under the age of 25.