Has solar reached a point where further price declines are not highly likely? If not, then most people I've talked to would hold off on going this route.
If prices will decline significantly in a year, then it would make sense to wait and deploy solar systems until further price declines are unlikely.
It's more a question is the returns this year > decline over this year vs any given gain. AKA I could wait 10 years and buy a beastly computer but I would have to use a 'crappy' PC for those 10 years.
If prices will decline significantly in a year, then it would make sense to wait and deploy solar systems until further price declines are unlikely.