If not for the tax Arrieta then Arrieta would probably already be signed to a large contract.
FTFY. If Arrieta wanted to be realistic about non-ace pitchers not being signed into their late-30s, he'd be signed already.
Basically, if Arrieta wanted 6/7 years, he shoulda been younger. If he wanted $30 million a year, he shoulda been better.
End of story.