Monero will not "take over" Bitcoin, but there is no reason there can't be multiple cryptocurrencies that are all used for separate situations. Monero for regular purchases, Bitcoin for a store of value similar to gold, 
for etc. This is how it will likely be in the future. There is no one cryptocurrency that will "take over".
For today monero will not take over bitcoin, i agree, but if developer of monero keeps be updating and there are many people who support for monero include companies. I think it can be take over bitcoin although it will be hard and need long time. for etc. This is how it will likely be in the future. There is no one cryptocurrency that will "take over".It is better if multiple communities can coordinate and work together. Monero is the most anon coin, once RingCT releases in january it will be light years ahead of other coins, and Bitcoin is the most widely used cryptocurrency right now, but isn't anonymous and that is ok. The better we can all get along the better it is for everyone. We all know how important cryptocurrencies are in the world and the impact they will have. Some coins will have different uses and better usecases for different things, Bitcoin may not be the best thing for purchases compared to Monero for privacy. Each coin has its specific value so use it right ?
