Hi Jimmy,
Yes, any notification of Change of Circumstances to DWP will trigger the switch to PIP. Of course, we have no way of knowing when that might happen anyway. The selection process is random (as far as we know) so you could hear tomorrow or in 2 years time!
I suggest you have a look at our PIP self-assessment, score yourself harshly (as DWP will) and, hopefully, that will help you decide whether to contact PIP or 'let sleeping dogs lie'.
The guide also explains the PIP process. I must warn you that, once this has been started, there is no going back, your DLA claim will be closed 1 month after the PIP decision, no matter what that decision is or how long your DLA had left to run.
Nothing on this board constitutes legal advice - always consult a professional about specific problems