Cursive writing is also a lot faster than block text which is a major consideration of writing. If it is so easily replaced, then kanji can be substituted for a simpler system as well. Japan could just move to a romaji system and remove the confusion between Chinese and Japanese meanings. Kanji is as plagued by poor penmanship as cursive. And similarly, they could just write everything using hiragana/katakana. I don't think this should happen, but I think it's about as tragic as the loss of cursive writing.

As for spelling errors, I think it's a lot like the issue of research with wiki/google. Have a question? Find the answer in 10 seconds with wiki or google. The problem is, you tend to forget the answer just as quickly. In the days before the internet, if you had to look something up from multiple sources or ask others directly to get an answer, you'd remember that answer.