Bitcoin was the first of its kind, i first heard of it in 2011, and didn't think anything of it.... i feel very few people at first didn't invest much, but the people who did invest didn't have to invest much money, when it first came out, if you had invested $10, you would have a nice fortune now....because its sitting in the thousands now, i feel very few people for this reason wont invest in it, even if i did a $1000 now, i think it would take forever to see a huge outcome compared to the first investors. i feel the majority of the overall bitcoin online is from people who first bought in. Due to this i get the impression bitcoin will fall drastically here soon. Now that people see the uses and market for online currencies, a lot more people are paying attention to it, due to this, I'm feel the average person will invest in other coins like ethereum, ltc....etc, hoping for a big outcome like bitcoin had. Any opinions/advice is welcomed 
I understand where you are coming from and the idea that you are trying to share. However, things does not automatically works that way. Yes, many of us may feel that investing money in Bitcoin right now many not anymore be very viable because it has risen in value astronomically and the return may not be the same compared to those who made it in its early stage.
The reasoning can be flawed because it can be based on the assumption that Bitcoin can be playing on the same market but we are seeing more and more markets being opened for Bitcoin. There are more players and buyers entering into Bitcoin everyday and many of them are very enthusiastic about its future. Another trend for Bitcoin is the coming of fund managers or those who are pooling funds from their clients and this is a big market too.
People who are interested with other coins are also using Bitcoin as the currency to buy them and when they feel that it is time to sell those altcoins they usually converted them into Bitcoin again. This is just the dynamic of the market and once the market is getting bigger and bigger you don't have to worry about your concern here.