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 Hay guise 
I find it really unlikely. As you can see in the Pie chart on the right, the world is a good place for the English language: roughly 1 out of 2 people in the world speak an Indo-European language (that's the language stock English belongs to), and these speakers are probably more receptive to English than Mandarin, for example. However, there are too many languages out there with an overwhelming number of speakers.
Here, let's take a look at the most spoken languages in the world:- More than 100 million speakers: Mandarin, Spanish, English, Hindustani, Arabic, Bengali, Portuguese, Russian, Japanese, Punjabi;
- Between 100 and 50 million speakers: German, Javanese, Wu, Marathi, Telugu, Vietnamese, French, Korean, Tamil, Yue, Turkish, Pashto, Italian;
- Between 50 and 10 million speakers: Min Nan, Gujarati, Polish, Persian, Bhojpuri, Awadhi, Ukrainian, Malay, Xiang, Malayalam (NOT MALAY!), Kannada, Maithili, Sundanese, Burmese, Oriya, Marwari, Hakka, Thai, Hausa, Tagalog, Romanian, Dutch, Gan, Sindhi, Uzbek, Arzeibaijani, Rajasthani, Lao-Isan, Yoruba, Igbo, (Northern) Berber, Amharic, Oromo, Chhattisgarhi, Assamese, Kurdish, Serbo-Croatian, Sinhalese, Cebuano, Rangpury, Malagasy, Khmer, Sotho-Tswana, Nepali, Rwanda-Rundi, Somali, Madurese, Haryanvi, Mula, the language Meat hates the most, Magahi, Greek, Chittagonian, Deccan, Hungarian, Catalan, Shona, Min Bei, Zulu, Sylheti.
The odds of English displacing one of these languages (or all of them!), unless something external kills off its speakers, are very slim. No matter how integrated the speakers of these languages are with the world economy, English will always be a second language or a foreign language to them. Firstly because you've being very optimistic about education levels throughout the world: I speak English, but I'd be surprised if a fifth of Brazilians (if that) can converse with you in your native language. Also because humans are used to speaking more than one language anyway.
See Tamil up there in the list? One of India's largest shanty towns, Dharavi, is a Tamil enclave in a Hindi-speaking area. No matter how much influence Hindi has over this slum, residents haven't switched to it (just yet) - even though I'm sure bilingualism there isn't rare. If you add English in the mix, that's a third language for them, but hardly a reason to ditch their native language. In a larger scale, Portuguese has always been surrounded by Spanish - since its inception - and it's still going strong with no signs of merging with its most prestigious neighbour, no matter how close they are to one another. Mainly because people resist to ditch their native language unless they are firmly integrated in a larger community. That's why 2nd and 3rd generations of immigrants usually adopt the language of the host country, whereas their cousins living in the motherland still hold to it.
Don't get me wrong, though. There are many endangered languages, that's for sure, and there's an oft-cited prediction that 90% of all languages spoken in 2000 will have disappeared by the end of this century. But these are all moribund languages, teetering on the brink of oblivion, with few thousand spekaers - if that. THESE languages are going to die. Mandarin and Dutch? I very much doubt it 
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Will English kill off all other languages eventually?
