When the concord agreement was first done it had a purpose that is now outdated to a big degree. the TV and race fee marketing wasn't centralized and the FIA was in a governing and commercial role. that is completely different now. separation between rules process and the marketing is practically complete due to the EU requirement and the FIA FOM deals. the three corner deal between the FIA, the FOM and the teams has largely broken down to three separate fields. marketing between teams and FOM, commercial rights between FIA and FOM and championship participation between FIA and the teams.
obviously the FIA is of the opinion that participants in the championship must not necessarily be constructors. the problem is that this position isn't negotiated with the FOM. the question has a big impact on the value of a team because in the concord agreement only the original constructors were allowed to participate in the championship which shuts out new competitors from the cartell. the question is: will this model work in the next 8 years? the way the teams are dying it is very questionabel. and something that does not work should not be exclusively implemented only because is has somehow worked at a different time.
I see the budget issue not necessarily qualitatively linked with the constructors issue. the majority has decided that for now the constructors status is required again from 2010 and the FIA is supposed to implement that unless it sees fundamental problems for the sport.
there is certainly a quantitative influence. the budget must be uniform and higher if every team is constructor. if not there could be two classes of participants with different commercial benefit classes and budgets.
ideally a solution should be defined for both models. at the moment they could start with the constructor modell. if the number of teams collapses they would have the customer model ready to go and no negotiations are necessary any more. the switch could be implemented with the necessary swiftness to save the championship.