you are correct that destroy artifacts spells would hurt this deck, but myr resevoir just brings the myrs right back. I have a white myr artifact deck and have had people blow up an artifact and I just bring it right back every time. Here's my deck. http://www.mtgvault.com/ViewDeck.aspx?DeckID=132192
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Ya I dropped them to make room for some other things. They have been helpful at times but are usually just a waste of time to bring out and use.
Nice deck, I probably take out Gold Myr and put in Perilous Myr. The reason being you wont be mana starved and Perilous Myr gives you an instant spell when it dies. I also look at replacing Origin Spellbomb with Myr Propogator (If making more Myrs is more important than drawing 1 card to you). Here's my Myr deck. http://www.mtgvault.com/ViewDeck.aspx?DeckID=132192