For Chu Nom, It's hard with writing but learn how to read it is easy as well as the meaning. Well, I don't think the government needs to spend a lot of money with it. In Vietnam, there're a lot of students learning Chinese and most of them are interested in Chu Nom as well.
I don't deny the fact that Quoc Ngu is easy. But both have good and bad points. Chinese characters have more meaning in it while knowing Quoc Ngu, you can pronounce any words even if you don't know the meaning. The bad points of Quoc Ngu is people can't difference the word as a single character, and they need double words to know the meaning (truc thang ; thang = fly up , truc = vertical.) But how's about: truc giac, chinh truc. They have the same but different meaning and they are written differently in Chu Nom.
Like someone mentions before the words: Dat Nuoc . The word Nuoc has the Country character Quoc (Quoc Gia 国家 ) ,

while the word Nuoc as water is written as

the 3 dots has the Water character (水)
For Vietnamese people, they can difference it as they're used to it. But for example a foreigner learning Vietnamese. When they look up dictionary in Quoc Ngu. Both are written the same way and the meaning are completely so far away (water, country). Then they have to learn when it's water, when it's country and it makes Vietnamese becoming harder for foreingers to learn.
I don't mean Vietnamese people should go back to use Chinese characters as I know many people don't like Chinese. But we must look at the weakness of Quoc Ngu. China's becoming richer because of the fact many foreigners coming to China as well as learning Chinese. I don't deny the fact that many foreigners also coming to Vietnam but all have the same problems learning Vietnamese.
There's a saying like this: If you want to know my mind, speak English. If you want to know my heart, speak my language. So for the future of Vietnam, In my opinion, we should study both Quoc Ngu and Chu Nom. It means we will have 2 writing system go together. The befinits of it is Vietnamese student can learn European languages easily (English, French,Spanish) while study Asian language (Chinese,Japanese) easily as well. Besides, Vietnamese can understand literature (poems, stories) written in Chinese and Chu Nom, read their family's trees, as well as understand what written in temple, old castle in Hue, etc.