The ring could have been destroyed a lot easier.

[obloquy]

The successful destruction of the Ring was owed almost entirely to the Valar. It was they who sent the Istari, and it was Gandalf who saved Middle-earth by engineering and manipulating the events of the War of the Ring. Mount Doom, we're told, is the only fire that can unmake The One Ring; not just because it's the only fire hot enough, but because it is the fire in which it was originally forged: there's a metaphysical connection there. Taking the Ring to Aman would have done nothing to destroy Sauron, since as long as the Ring existed, Sauron was impossible to permanently eradicate. The only way, in fact, to defeat Sauron once and for ever was to destroy the Ring, which, as I pointed out above, could not have been done anywhere but Mount Doom. The Valar acted exactly how they should have by assigning the Istari to their mission--particularly in selecting the humble but mighty Olorin.