Regarding:
Article VIII, SECTION 4. Transfer of powers.—By law or by resolution of the governing bodies of each of the governments affected, any function or power of a county, municipality or special district may be transferred to or contracted to be performed by another county, municipality or special district, after approval by vote of the electors of the transferor and approval by vote of the electors of the transferee,
or as otherwise provided by law.
This has that squirrely "or as otherwise provided by law" that seems to be the legislature's get-out-of-jail-for-free card on so many provisions.
Regarding:
Ad valorem taxes, exclusive of taxes levied for the payment of bonds and taxes levied for periods not longer than two years when authorized by vote of the electors who are the owners of freeholds therein not wholly exempt from taxation, shall not be levied in excess of the following millages upon the assessed value of real estate and tangible personal property: for all county purposes, ten mills; for all municipal purposes, ten mills; for all school purposes, ten mills; for water management purposes for the northwest portion of the state lying west of the line between ranges two and three east, 0.05 mill; for water management purposes for the remaining portions of the state, 1.0 mill; and for all other special districts a millage authorized by law approved by vote of the electors who are owners of freeholds therein not wholly exempt from taxation. A county furnishing municipal services may, to the extent authorized by law, levy additional taxes within the limits fixed for municipal purposes.
We have to consider the U.S. Constitution's Contracts Clause as well as what the Florida Constitution says about
existing debt:
SECTION 3. Consolidation.—The government of a county and the government of one or more municipalities located therein may be consolidated into a single government which may exercise any and all powers of the county and the several municipalities. The consolidation plan may be proposed only by special law, which shall become effective if approved by vote of the electors of the county, or of the county and municipalities affected, as may be provided in the plan. Consolidation shall not extend the territorial scope of taxation for the payment of pre-existing debt except to areas whose residents receive a benefit from the facility or service for which the indebtedness was incurred.
And:
(a) POLITICAL SUBDIVISIONS. The state shall be divided by law into political subdivisions called counties. Counties may be created, abolished or changed by law, with provision for payment or apportionment of the public debt.
RCID's existing debt
must be paid, while RCID's electors (presumably) had already approved a higher millage. Whatever replaces RCID (and specifically those electors) is not going to be able to avoid paying this existing debt.