if i remember correctly , in the govs new proposals, you need to have at least the minimum income when you apply for ILR, FLR or for a settlement visa, thou i would have thought there would be a transition period for those soon to be applying for ILR maybe FLR?.
also i can't see the HO deporting people become of not reaching the minimum income, that would be
that you've been here near 2yrs, married to a British citizen and then told to leave, can't see it happening, not with article 8. more likely and common sense might be that you would have to apply for FLR or keep applying for FLR until you reach the minimum income. so stopping those from claiming ILR and recourse to public funds.