Just to put things in perspective.
There are very many aircraft types out there that do not meet the requirements for using ADS-B for ATC separation. Therefore in regions where ADS-B separation is available they must be segregated, separated procedurally and may as a result get an inferior service.
The only issue here is that the 787 as a new aircraft should be meeting the standards and apparently is not. If the aircraft was falsely reporting a high integrity ADS-B then this would be a significant safety issue. But now the problem is identified and the type is blacklisted the 787 is simply relegated, for the time being, to the level of all those other types that do not meet the standard.
However this is an ADS-B issue only and does not affect normal radar separation (primary or secondary) in any way.