I predict that GA is going to become polarised into recreational and high end activity in the next few years anyway. The only employed instructors will be in the commercial and high end training side of things, and recreational GA will become more like some other European nations with the resurgence of clubs, volunteer isntructors and day VFR aircraft. The chances of anyone ever again being paid a going wage for anything other than commercial instruction are nigh on dead. Therefore if you aren't after a salaried lifestyle I'd say go for it. I wouldn't bother with a CRI at the moment unless you have particular skills to teach (e.g. LAA types) as I know stacks of CRIs who have done virtually no instruction since getting the qualification.