I bought my PH3 P last Xmas and while I'm happy to explore all of its features, whatever DJI brings out to replace the PH3P is not a concern to me right now. One should master what you have now, before hoping over to a bigger bird. Learn, absorb and do what needs to be done to gain proficiently. Once you have that, and have probably by then 'outgrown' your PH2P, then you can upgrade to an Inspire 1.
Over here in Australia, one can fly any Drone up to 2kgs gross weight for pleasure/profit. Over that one needs to hold a UAV license issued by our CASA (Civil Aviation Safety Authority) who are same as the FAA in the US. Anyone caught operating a big bird without a license, faces huge fines as you are now flying in airspace of a fix or rotary wing aircraft. To get this license, one must complete a 5 day full time course like this one...
www.rpa.net.au and sit for exams, sim flights and do real flights and be judged on your ability to know the same rules as going for fixed or rotary wing aircraft.
Once you have that license, you must maintain a Pilot's Log Book and inform CASA of every flight above 400ft. Under that, you don't need to. When the CASA inspectors do random checks on their licensed pilots be that for a UAV, plane or helicopter, your records must tally up with their records based on what you told them. If they don't, you're done for. My instructor told me that if you are not sure what to do even in an emergency, then don't fly! Simple as that.