Depends how much you've spent on bulbs.Sure, they can upgrade but the question is, how much is it going to cost to do so? I can upgrade my existing Insteon system to be HomeKit-compatible, too, but it's going to cost me $150 for a new Insteon hub.
Embarrassed as I am to admit it, I've spent way more than I intended on bulbs, light strips and taps. They're addictive.