Very true, but a contract is a contract. Unless you have a bad lawyer - then your contract is subject to said restructuring and it's them you should be mad at.
I remember as a young man, with a contract clearly broken, going to my Aunty who was/is a major corporate lawyer and explaining the situation to her.
She said: how much do you want to spend enforcing the breach.
I said, what?
She said, A contract is only worth what you are prepared to spend to defend it, if it comes to a breach.
Otherwise, try and renegotiate something you can live with and move on.
Sounds like she didn't even have a breach of contract- the new owners optioned an already existing clause.
Every contract has get out clauses.
Contracts are "broken" even day using these clauses.