I don't know if the available of online marriages in Utah can be considerate a loophole. But online marriages available in Utah soon will attract a panacea of interest and use. But it certainly will be drawing attraction to Utah as being a portal of online marriages.
As it stands I don't see a problem YET.
One problem I see beyond the scope of this being legal, is when you try to bring your marriage partner into the US. So theoretically when immigration looks at an application and see the couple was married in Utah it may raise a red flag that if they were married in Utah, so did she get into the country legally to get married? Since the marriage certificate does not say internet marriage, what is immigration going to think?
Now here is the problem, if immigration thinks you entered the country illegally to get married, there is a 10 year bar to re-enter. Suppose you came on a tourist visa or some other visa and you let it expire. Then getting married to a US citizen afterwards does not change anything.
So maybe getting into the Philippines with that Utah marriage certificate, gets you in. Maybe a good idea is to get remarried in the Philippines and when & if you and your marriage partner decide to go to the states, use your Philippine marriage certificate to keep things simple.