My thought is that they need a cruiser, maybe the Zumwalt could work? I just don’t know enough about the system specifics to know if it would make a worthy replacement to the Tico. This would also mean continuing to produce Zumwalts, but considering they failed initiate a successor class in like 30 plus years they should expect to pay a price.They were originally designed to equip the SPY-4 radar, which is roughly the same size as the 37 RMA SPY-6 on board CVN-79 and DDG-51 FLTIII. There shouldn't be any problem to upgrade them. However, operating high power radars will defeat their expensive stealth measures.
I think the Navy wanted at one point to fit the much larger 67 RMA on their future cruisers. Such a radar could see a target half the size at four times the distance as the current SPY-1D radars.