When you mentioned or requested something, but you could be persuaded by others with the different opinion, finally you agreed with it, then you can say " 倒也是“ for example: A: 国庆节咱们去旅游吧？Shall we go out for travelling in the coming national day? B: 算了吧，人会很多的 forget it, there will be crowd everywhere by then A：倒也是

this one can be used when you agree with what the other person says that you didn't think about yet or ignored

You know,For Chinese, there are different meanings when using in different condition. Any sentence has two sides, the internal side and the external side For this sentence: 倒也是 translate into English: Well，that's it! The external meaning is that you agree with someone's opinion. Here are two different conitions, which the internal side is different 1. When you get different opinion with someone, You just want to exit the argument , you may say 倒也是 to compromise with him. 2. When someone explains you, and at last he corrects you wrong idea, you may say 倒也是 to agree with someon. 倒也是 is an attitude of generosity and Confucianism. I hope it will useful to you, enjoy Chinese language learning.

表示赞同对方的说法的时候，但是不是一开始就赞同，而是后来经过了对方的解释以后才会用到的，举个例子。 A：我觉得你的衣服太贵了。 B：可是这个是从国外进口的，会有很多成本在里边，比如关税什么的。 A：那倒也是。 以上对话当中，A起初提出了一个观点就是衣服贵，经过B的解释，认同了B的观点，所以就说那倒也是。不知道这样说是否明白。

Cindy is correct ~.bingo!