I spent the time and money doing one last winter and have not regretted it for a moment. Heartily recommended to anyone who has the means and the medical.
On future regulation, the one clear message seems to be that if you have a valid one at the changeover then you'll get to keep it.
Also, if things go as the NPA, you can use both your IMC training and subsequent real IMC P1 time towards the EIR and CBIR.