Yes, your current role will work fine, it will not have any issues.
Looks like in ur current you using Java based ESS/MSS apps. They will not have any impact.
You can use the current role, you need not migrate until you want to use any WDA EhP6 based applications. For one of the client, we have implemented the similar approach, the countries which were in live with ESS/MSS continued to use the WDJ applications and for new roll-outs we created new role with WDA apps.