Is it worth mining Litecoins? Is it worth mining Litecoins and then exchange them for Bitcoins (because I am not sure if there will be space for more crypto currencies in the future)?

I can get about 25k hash/sec by CPU mining on my laptop, so this turns in something about 0.1 LTC per day which is 0.06 BTC per month (current exchange rate is 1:50). Does my approach make any sense or is there nowadays even any way to mine with everage/above average hardware?
I wouldn't suggest to mine with your laptop further more I wouldn't mine with a CPU any more. Your laptop can damage quite fast, because mining is very hardware intensive and it can overheat your components. After some time they will get damaged because they are not build to hold that power over a long period of time.

Your hashrate is quite low. With litecoins you are not going to come very far. You better use a graphics card (GPU) to mine litecoins or if you can't afford one, switch to another coin. See the links below for other coins and hardware comparison.


Cryptocoins
Mining hardware comparison