And what happens after you eat this stuff for 50 years or so?
Conversely, imagine if sugar were a newly discovered sweetening compound, seeking FDA approval. They wouldn't get past one safety trial before "serious concerns about long term effects" knocked it out of the running.
Analyzing the relative risks of sugar and sucralose, there is just no case to be made for sugar being the safer bet.
The fact is that there is no more reason to believe that sucralose will have some as yet unobserved negative health effect than there is to believe that it will have some as yet unobserved health benefit.