Now that I think about it, it's possible to use monero right now without exposing yourself to its volatility. If you use an exchange where you can short monero on the xmr<->btc pair, just do a 1x short.
As monero falls to lower and lower prices in satoshi terms, your bitcoin stash on that exchange will grow by an equivalent amount. Conversely, if monero grows in value in satoshi terms, your bitcoin stash will go down, but your monero stash will increase proportionally to equal out the difference. Whenever you want to cash out of monero you can sell your xmr tokens for bitcoins, putting you at the same amount of bitcoins you had when you started (minus some exchange fees).
So if you want to buy and use -- say -- $300 of xmr, first put up a 1x short on monero using $300 of your bitcoin as collateral. As you spend it, reduce your collateral til you're all out of both monero and collateral, then if you want to you can put up collateral again to repeat the procedure.
This does mean you have counterparty risk on the exchange as well as slippage risk due to trading fees and low liquidity on that trading pair. But for some people who want to treat monero like a sidechain, this is a way to do it that should work today. But the "peg" is secured by a centralized entity (the exchange), so there is that.
And they are working on atomic swaps wirh BTC as we speak 🙃